With hedge funds suffering from poor performance in 2018, investment managers are likely to to take home smaller paychecks, according to a new report.

"Hedge funds had a bad year," said Adam Zoia, chief executive officer at compensation advisory firm CompIQ, which published the data. "Of course, the year is not over, but so far, it's not good."

Median compensation - including base and bonus - for senior analysts is expected to decline by as much as 12%, to $572,000 in 2018. For portfolio managers, it is likely to fall to $967,370, down 15% year-over-year, the report said.

Junior investment professionals and back office employees will be shielded from the volatility, Zoia said. The report predicts a 1% decrease in median pay for junior analysts.

The hedge fund industry has historically been known for its eye-popping salaries, with managers such as Bridgewater Associates' Ray Dalio and Appaloosa Management's David Tepper among the world's wealthiest.